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Most people use “low” to refer dstasheet either a lower voltage, or a lower position on the diagram. If I remove the 2. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. I will be certain to use them here from now on.

It just shortens the range of turn dtaasheet which the potentiometer works. Vref is the high side of the 5 LED comparators in the datasheet block diagram. It sounds like you’re trying to drive this circuit with a signal that includes a considerable DC bias, which explains why all of the LEDs light up right away when you remove short out the capacitor.

Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

(PDF) AN6884 Datasheet download

However, if that’s the case, I can’t explain why reversing the capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is.


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That is to say that the LEDs all come on at a much smaller turn of the potentiometer. The LED pins connect to the negative side of the LEDs, and the pins go low when the output of the internal amp goes above Vref dropped by voltage dividing resistors at each comparator. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

You should fix the capitalisation of sentences and electrical units ‘F’ for dtaasheet to improve daasheet and credibility. Passing Vin through a reverse capacitor seems to be potentially more prone to failure. That’s clear, because the input in my test circuit is DC. Indeed, it must in order for any of the LEDs to turn on!

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AN Datasheet pdf – 5-Dot LED Driver Circuit – Panasonic

Sign up using Facebook. That means there is a small current flow out from the pin. Reverse biased capacitor on IC input pin Ask Question. By “low side”, you’re referring to the inverting inputs of the comparators. There is also no discharge path xatasheet your arrangement. It’s the DC bias determine the polarity.

(PDF) AN Datasheet PDF Download – 5-Dot LED Driver Circuit

The diode will mess up the response of the chip due to its forward voltage drop. So it determines the DC bias of the block capacitor’s polarity.


Your description doesn’t agree with that in the datasheet. I am looking at the test circuits on the data sheet for dataxheet AN VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: How does doing anything to pin 7 or pin 8 affect that? It appears to be reversed.

5+1 led vu-meter with AN6884

I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer.

Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Fadecomic 2 6. Pin 8 is the signal input datashee, and it’s the internal Op amp’s positive input.

Sign up using Datashete and Password. There’s still a much shorter range over which a varying number of LEDs come on.

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